CA1096671A - Electrically controllable pivoting mirror arrangement - Google Patents
Electrically controllable pivoting mirror arrangementInfo
- Publication number
- CA1096671A CA1096671A CA295,190A CA295190A CA1096671A CA 1096671 A CA1096671 A CA 1096671A CA 295190 A CA295190 A CA 295190A CA 1096671 A CA1096671 A CA 1096671A
- Authority
- CA
- Canada
- Prior art keywords
- mirror
- bearing
- pivoting
- pivoting mirror
- permanent magnetic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/1821—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
- G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
- G11B7/0925—Electromechanical actuators for lens positioning
Abstract
ABSTRACT:
An electrically controllable pivoting mirror arrangement comprises a pivoting mirror which is mount-ed on a frame with the aid of a mirror support and which carries permanent magnetic field for electrical pro-ducing a permanent magnetic field for electrical con-trol purposes. Between the pivoting mirror and the per-menent magnetic means a mounting plate is located which comprises means for positioning the pivoting mirror and the permanent magnetic means. The mounting plate may also serve for clamping a mirror bearing which is made of rubber-like material or of positioning the mirror bearing when this is glued onto the back of the pivot-ing mirror.
An electrically controllable pivoting mirror arrangement comprises a pivoting mirror which is mount-ed on a frame with the aid of a mirror support and which carries permanent magnetic field for electrical pro-ducing a permanent magnetic field for electrical con-trol purposes. Between the pivoting mirror and the per-menent magnetic means a mounting plate is located which comprises means for positioning the pivoting mirror and the permanent magnetic means. The mounting plate may also serve for clamping a mirror bearing which is made of rubber-like material or of positioning the mirror bearing when this is glued onto the back of the pivot-ing mirror.
Description
The invention relates to an electrically controllable pivoting mir:ror arrangement which is suitable ~or use in an apparatus for optically read-ing information tracks of an information ~arrier with the aid of a beam of radiation, or for writing infor-mation tracks on an information carrier, more in par- -ticular suitable for use in an optically reading video disc player, and comprising a frame, a pivoting mirror with a reflecting front and with a back, permanent magnetic means which are rigidly mounted on the back of the pivoting mirror for producing a permanent mag-netic field for the electrical control of the pivoting mirror, and a mirror support for pivotably supporting the pivoting mirror and comprising a bearing support which is connected to the`frame and a mirror bearing which is disposed between the bearing support and the back of the pivoting mirror.
In the past the Applicant has filed several Applications for pivoting mirror arrangements of the above-mentioned type, see` f~r example the Applicant's Canadian Patents 1,056,628 and 1,070,998 which issued on June 19, 1979 and February 5, 1980 respectively.
Mounting the permanent magnetic means, for example con-sisting of two rod-shaped permanent magnets, on the 25 back of t:he pivoting mirror ::
:. , : , .
B
- .. ~ . . , ~ , . .:
~ PHN 8651 has the advantage that in conjunction with a sui-table bearing construction a bearing arrangement can be obtained which is such that the axis (or the axes in the case of an omni-directionally pivotable pivoting mirror) about which the pivoting mirror is pivotable pass(es) through the centre of gravity of the com-bination consisting of the pivoting mirror and the parts secured thereto which move along with the pivoting mirror. The importance of this will be explained further on. In view of the very stringent requirements imposed on the flatness of a pivoting mirror for use in a video disc player, it is desirable that the centre of gravity is located outside the pivoting mirror, so that no recesses in the mirror 15 itself are necessary which serve to transfer the '`
pivoting point or the pivoting axis of the bearing arrangement further towards the front of the pivot-ing mirror.
The stringent requirements imposed on the flatness of pivoting mirrors for use in video disc players result from the requirements imposed on the quality of a read spot which is to be concentrated on the information tracks of a video disc by means of an optical system provided for this purpose. In view of the desired high density of the video inform-ation on the clisc, the read spot should be of small size, have an as round as possible shape and - 3 - ~
. ~ . .
.. . . .
~ $,7~ PHN 8651 moreover exhibit a highly homogeneous distribution of the radiation lntensity over the light spot. This dictates quality requirements :Eor all the optical means which are disposed in the path of the radiation beam.
For example, in the case of a pivoting mirror with a front area oE approximately 10 by 13 mm an out-of-flatness not greater than 0.1 micron is permissible measured over the diagonal of the front of the pivot-ing mirror is. The pivoting mirror is generally made of glass and for the specified dimensions of the front side it has a thickness of approximately
In the past the Applicant has filed several Applications for pivoting mirror arrangements of the above-mentioned type, see` f~r example the Applicant's Canadian Patents 1,056,628 and 1,070,998 which issued on June 19, 1979 and February 5, 1980 respectively.
Mounting the permanent magnetic means, for example con-sisting of two rod-shaped permanent magnets, on the 25 back of t:he pivoting mirror ::
:. , : , .
B
- .. ~ . . , ~ , . .:
~ PHN 8651 has the advantage that in conjunction with a sui-table bearing construction a bearing arrangement can be obtained which is such that the axis (or the axes in the case of an omni-directionally pivotable pivoting mirror) about which the pivoting mirror is pivotable pass(es) through the centre of gravity of the com-bination consisting of the pivoting mirror and the parts secured thereto which move along with the pivoting mirror. The importance of this will be explained further on. In view of the very stringent requirements imposed on the flatness of a pivoting mirror for use in a video disc player, it is desirable that the centre of gravity is located outside the pivoting mirror, so that no recesses in the mirror 15 itself are necessary which serve to transfer the '`
pivoting point or the pivoting axis of the bearing arrangement further towards the front of the pivot-ing mirror.
The stringent requirements imposed on the flatness of pivoting mirrors for use in video disc players result from the requirements imposed on the quality of a read spot which is to be concentrated on the information tracks of a video disc by means of an optical system provided for this purpose. In view of the desired high density of the video inform-ation on the clisc, the read spot should be of small size, have an as round as possible shape and - 3 - ~
. ~ . .
.. . . .
~ $,7~ PHN 8651 moreover exhibit a highly homogeneous distribution of the radiation lntensity over the light spot. This dictates quality requirements :Eor all the optical means which are disposed in the path of the radiation beam.
For example, in the case of a pivoting mirror with a front area oE approximately 10 by 13 mm an out-of-flatness not greater than 0.1 micron is permissible measured over the diagonal of the front of the pivot-ing mirror is. The pivoting mirror is generally made of glass and for the specified dimensions of the front side it has a thickness of approximately
2% mm for reasons of rigidity, in combination with the said flatness requirement. In order -to prevent deformation of the mirror during manufacture or during use (for example under the influence of thermal stress) it is desirable that the mirror has a uniform thickness and consequently consists of a flat plage of material without recesses, cavities or local projections.
It is found advantageous to mount the pivoting mirror on the bearing support with the aid of a rubber-like elastic mirror support which is disposed between the back of the pivoting mirror and the bearing support. In the case of a suitable choice of the rubber--like material a substantial zero-point stability of l:he pivoting mirror arrangement can be achieved. Zero-point stability is to be understood as ~ 7~ PHM 8651 the extent to which the pivoting mirror, after dis-appearance of electric control signals, resumes its neutral position. Such bearing arrangements more-over have the advantage that they may be subjected both to tensile and compressive stress, so that a robust construction can be obtained which is shock and vibration proof. The internal damping of the mirror bearing is favourable for the dynamic behav-iour of the arrangement. In view of the dynamic behaviour it is furthermore favourable if the pivot-ing mirror pivots about an axis (or as the case may be a plurality of axes) which pass through the centre of gravity of the moving part of the pivoting mirror arrangement, because thus parasitic resonances in the mirror bearing arrangement can be avoided. However, -in this respect it is of great importance that the distance between the bearing support and the bac~ of the pivoting mirror is small, preferably smaller than
It is found advantageous to mount the pivoting mirror on the bearing support with the aid of a rubber-like elastic mirror support which is disposed between the back of the pivoting mirror and the bearing support. In the case of a suitable choice of the rubber--like material a substantial zero-point stability of l:he pivoting mirror arrangement can be achieved. Zero-point stability is to be understood as ~ 7~ PHM 8651 the extent to which the pivoting mirror, after dis-appearance of electric control signals, resumes its neutral position. Such bearing arrangements more-over have the advantage that they may be subjected both to tensile and compressive stress, so that a robust construction can be obtained which is shock and vibration proof. The internal damping of the mirror bearing is favourable for the dynamic behav-iour of the arrangement. In view of the dynamic behaviour it is furthermore favourable if the pivot-ing mirror pivots about an axis (or as the case may be a plurality of axes) which pass through the centre of gravity of the moving part of the pivoting mirror arrangement, because thus parasitic resonances in the mirror bearing arrangement can be avoided. However, -in this respect it is of great importance that the distance between the bearing support and the bac~ of the pivoting mirror is small, preferably smaller than
3 mm, for example of the order of magnitude of 1 to -~
1~ mm. In the case of too great dimensions of the elastic bearing, parasitic resonances will be pro-duced in the bearing. Moreover, the pivoting axis (or the pivoting point) is geometrically less exact.
Handling the parts of the pivoting mirror arrangement during assembly, which parts are partly vulnerable and partly small, presents serious problems.
In particular when the pivoting mirror arrangement should be suitable ~or mass production attention is to be paid to these problems. The pivoting mirror itself is provided with a radiation-reflecting sur-face layer at its front which can readily be damaged.Rubber-like elastic mirror bearings which may be used, are of very small dimensions, but bearing arrangements of a different type will also be small and are likely to consist o~ several parts. The per-manent magnets must be secured to the back of themirror in an accurately defined position. Generally ceramic permanent magnets are employed which are rarely very flat. It is found that for a correct mounting of the permanent magnets to the back of the pivoting mirror it is desirable -to use types of glue which do not cure ~uickly at room temperature, so that the`permanent magnet remains slightly readjust-able relative to the pivoting mirror after the application of the layer of glue, whilst the layer of glue must be suitabIe to at least partly fill any space present between the magnets and the pivoting mirror. A suitable type of glue is for example the glue which is commercially available under the type designations Araldite-D, which is a registered trade mark, (CIBA-Geigy Switzerland). Curing of the glue can be promoted at a higher temperature (for instance 70C) by placing the pivoting mirror with the perma-nent magn,Qts mounted on it ~A3 ~ 7~ P~IN 8651 in an oven. This method of mounting the permanent magnets on the pivoting mirror appears to give rise to a high percentage of rejects because after the glue has cured a number of pivoting mirrors no longer comply with the standards of flatness. Apparently the pivot-ing mirror tends to warp owing to stresses in the layer of glue between the permanent magnets and the pivoting mirror. Mounting the very small mirror bearing in an accurately defined position on the back of the pivoting mirror also gives rise to problems.
It is an object o~ the inven~ion to proviae a pivoting mirror arrangement of the type mentioned in the preamble whose various parts can be handled more easily during assembly, which yields less rejects owing `
to warping of the pivoting mirrors, and which is better suitable for mass production, and the invention is characterized in that between the pivoting mirror and the permanent magnetic means a mounting plate is inter-posed which on its side which faces the pivoting mirror is provided with means for positioning the pivoting mirror and on its other side is provided with means for positioning the permanent magnetic means. The,mounting plate has a plurality of functions. In the first place it is an aid` for accurately positioning the permanent magnets and the pivoting mirror. Secondly, it is possible to connect the permanent magnets first to the mirror ~ ~ Q~ ~7 ~
mount, before fitting the pivoting mirror. It is then possible to use another type of glue ~or securing the permanent magnets to the mounting plate than for mount-ing the pivoting mirror. It is for example found to be advantageous to mount the permanent magnets onto the mounting plate with the aid of the previously mentioned type of glue Araldite-D, which is a registered trade mark, and to mount the pivoting mirror with the aid of a type of glue which is commercially available under the designation "Loctite IS 04 E", which is a registered trade mark, (Loctite, USA). This type of glue is almost as thin as water and can be applied after the pivoting mirror has been placed onto the mounting plate. Owing to the capillary action the liquid glue enters the small space between the pivoting mirror and the mount-ing plate, where it cures within a few seconds in the absence of air.
When a rubber-like elastic mirr~r bearing of the previously mentioned type is used an embodi-ment of the invention is also of importance which is - characterized in that the mounting plate is provided with bearing mounting means on both sides of the mir-ror bearing between which the mirror bearing is clamped by its own elasticity. When this embodiment is used the bearing can be secured to the mirror mount wi1:hout glueing. However, if it is desirable to glue 1:he mirror bearing to the actual pivoting mirror, another embodiment is of advantage in which '3~
.
~ PHN 8651 the mounting plate is provided with means for posit-ioning the mirror bearing.
The invention will now be described in more detail wi-th reference to ~he drawing, in which:
Fig. 1 is a perspect:ive view, partly in cross-section of an embodiment of the invention in which the mirror bearing is clamped onto the mounting plate, Fig. 2 is an exploded view of the pivoting mirror arrangement in accordance with Fig. 1, and ig. 3 is an exploded view of some parts of an alternative embodiment, in which the mirror bear-ing can be connected to a pivoting mirror by glueing.
The pivoting mirror arrangement in accord-ance with Figs. 1 and 2 comprises a frame 1, pivot-ing mirror 2 having a reflecting front 3 and a back
1~ mm. In the case of too great dimensions of the elastic bearing, parasitic resonances will be pro-duced in the bearing. Moreover, the pivoting axis (or the pivoting point) is geometrically less exact.
Handling the parts of the pivoting mirror arrangement during assembly, which parts are partly vulnerable and partly small, presents serious problems.
In particular when the pivoting mirror arrangement should be suitable ~or mass production attention is to be paid to these problems. The pivoting mirror itself is provided with a radiation-reflecting sur-face layer at its front which can readily be damaged.Rubber-like elastic mirror bearings which may be used, are of very small dimensions, but bearing arrangements of a different type will also be small and are likely to consist o~ several parts. The per-manent magnets must be secured to the back of themirror in an accurately defined position. Generally ceramic permanent magnets are employed which are rarely very flat. It is found that for a correct mounting of the permanent magnets to the back of the pivoting mirror it is desirable -to use types of glue which do not cure ~uickly at room temperature, so that the`permanent magnet remains slightly readjust-able relative to the pivoting mirror after the application of the layer of glue, whilst the layer of glue must be suitabIe to at least partly fill any space present between the magnets and the pivoting mirror. A suitable type of glue is for example the glue which is commercially available under the type designations Araldite-D, which is a registered trade mark, (CIBA-Geigy Switzerland). Curing of the glue can be promoted at a higher temperature (for instance 70C) by placing the pivoting mirror with the perma-nent magn,Qts mounted on it ~A3 ~ 7~ P~IN 8651 in an oven. This method of mounting the permanent magnets on the pivoting mirror appears to give rise to a high percentage of rejects because after the glue has cured a number of pivoting mirrors no longer comply with the standards of flatness. Apparently the pivot-ing mirror tends to warp owing to stresses in the layer of glue between the permanent magnets and the pivoting mirror. Mounting the very small mirror bearing in an accurately defined position on the back of the pivoting mirror also gives rise to problems.
It is an object o~ the inven~ion to proviae a pivoting mirror arrangement of the type mentioned in the preamble whose various parts can be handled more easily during assembly, which yields less rejects owing `
to warping of the pivoting mirrors, and which is better suitable for mass production, and the invention is characterized in that between the pivoting mirror and the permanent magnetic means a mounting plate is inter-posed which on its side which faces the pivoting mirror is provided with means for positioning the pivoting mirror and on its other side is provided with means for positioning the permanent magnetic means. The,mounting plate has a plurality of functions. In the first place it is an aid` for accurately positioning the permanent magnets and the pivoting mirror. Secondly, it is possible to connect the permanent magnets first to the mirror ~ ~ Q~ ~7 ~
mount, before fitting the pivoting mirror. It is then possible to use another type of glue ~or securing the permanent magnets to the mounting plate than for mount-ing the pivoting mirror. It is for example found to be advantageous to mount the permanent magnets onto the mounting plate with the aid of the previously mentioned type of glue Araldite-D, which is a registered trade mark, and to mount the pivoting mirror with the aid of a type of glue which is commercially available under the designation "Loctite IS 04 E", which is a registered trade mark, (Loctite, USA). This type of glue is almost as thin as water and can be applied after the pivoting mirror has been placed onto the mounting plate. Owing to the capillary action the liquid glue enters the small space between the pivoting mirror and the mount-ing plate, where it cures within a few seconds in the absence of air.
When a rubber-like elastic mirr~r bearing of the previously mentioned type is used an embodi-ment of the invention is also of importance which is - characterized in that the mounting plate is provided with bearing mounting means on both sides of the mir-ror bearing between which the mirror bearing is clamped by its own elasticity. When this embodiment is used the bearing can be secured to the mirror mount wi1:hout glueing. However, if it is desirable to glue 1:he mirror bearing to the actual pivoting mirror, another embodiment is of advantage in which '3~
.
~ PHN 8651 the mounting plate is provided with means for posit-ioning the mirror bearing.
The invention will now be described in more detail wi-th reference to ~he drawing, in which:
Fig. 1 is a perspect:ive view, partly in cross-section of an embodiment of the invention in which the mirror bearing is clamped onto the mounting plate, Fig. 2 is an exploded view of the pivoting mirror arrangement in accordance with Fig. 1, and ig. 3 is an exploded view of some parts of an alternative embodiment, in which the mirror bear-ing can be connected to a pivoting mirror by glueing.
The pivoting mirror arrangement in accord-ance with Figs. 1 and 2 comprises a frame 1, pivot-ing mirror 2 having a reflecting front 3 and a back
4 opposite thereto. A mirror support for pivotably supporting the pivoting mirror on the frame comprises a bearing support 5 which is connected to the frame and a rubber-like elastic mirror bearing 6 which is interposed between the bearing support and the back of the pivoting mirror. This bearing consists of chloroprene rubber and is already connected to the .... . .. ..
bearing support 5 during the manufacture in mould.
A light metà:L mount bears the reference numeral 7.
The pivoting mirror 2 is glued thereto.
_ g _ .
.
~ $~ P~IN 8651 The mounting plate 7 consists of an alumi-nium plate which at its side which faces the pivoting mirror 2 is provided with a number of stops 8 ~or positioning the pivoting mirror and at its other side with a number of stops 9 and 10 for positioning two permanent magnets 11.
In the mounting plate 7 a slot 12 is ~ormed at the edges of which two oblong stops 13 are disposed whose length is smaller than the length of the slot 12. The bearing 6 can be inserted in the slot 12 between the stops 13 with a sliding movement. The width of the slot 12 is such that the mirror bearing is clamped between the stops 13 by its own elast-icity.
The bearing support 5 is fitted in a slot 14 of the frame 1, two strip-shaped limbs 15 of the bearing support being disposed OIl both sides of a ridge 16 which bridges the slot, which ridges has a width which corresponds to the distance between the two limbs 15. After the limbs 15 have been passed through the slot 14, a plate 17 is fitted over the ends o~ the two limbs, in which plate 17 slots 18 are formed which correspond to the limbs 15. The bearing support 5 is finally secured in the framel by twist-ing the ends of the limbs 15. As a result the bearingsupport is firmly pulled onto the ridge 16 and is thus positioned relative to the frame 1.
Around the pivoting mirror 2, the mounting plate 7 and the permanent magnets 11 an annular con-trol coil 19 is mounted on the frame. By applying control voltages to the control coil the pivoting mir-S ror is pivoted about its pivoting axis 20.
Further details about the mirror bearing used in the pivoting mirror arrangement in accordance with Figs. 1 and 2 and also about that shown in Fig. 3 can be found in the` Applicantls Canadian Patents 1,070,998 and 1,078,155 which issued on February 5, 1980 and May 27, 1980 respectively.
Fig. 3 shows a different embodiment of the invention, having a bearing support 21 which has a bearing head 22 in which a slot 23 is formed which continues in a cylindrical rod 24~ A bearing 25 made of chloroprene rubber comprises a lower flange 26, an upper flange 27 and a connecting strip 28. The flange 27 is inserted into a slot 29 in the bearing head 22, so that with the aid of an auxiliary tool (not shown) the slot 23 can be widened temporarily.
The mounting plate 30 has stops 31 and 32 for a pair of permanent magnets and stops 33 and 34 for a pivoting mirror. An opening 35 is located in the centre which opening in respect of its dimensions corresponds to the upper flange 26 of the mirror bearing 25. Along the edges stops 36 and 37 are , .
,.
,., . : -: ; , -, ~
J~
located. The upper flange 26 of the mirror bearing 26 can be glued to a pivoting mirror, for example with the said glue ~octite, which is a registered trade mark. The stops 36 and 37 serve for positioning the mirror bearing during glueing.
- 12 ~
.
bearing support 5 during the manufacture in mould.
A light metà:L mount bears the reference numeral 7.
The pivoting mirror 2 is glued thereto.
_ g _ .
.
~ $~ P~IN 8651 The mounting plate 7 consists of an alumi-nium plate which at its side which faces the pivoting mirror 2 is provided with a number of stops 8 ~or positioning the pivoting mirror and at its other side with a number of stops 9 and 10 for positioning two permanent magnets 11.
In the mounting plate 7 a slot 12 is ~ormed at the edges of which two oblong stops 13 are disposed whose length is smaller than the length of the slot 12. The bearing 6 can be inserted in the slot 12 between the stops 13 with a sliding movement. The width of the slot 12 is such that the mirror bearing is clamped between the stops 13 by its own elast-icity.
The bearing support 5 is fitted in a slot 14 of the frame 1, two strip-shaped limbs 15 of the bearing support being disposed OIl both sides of a ridge 16 which bridges the slot, which ridges has a width which corresponds to the distance between the two limbs 15. After the limbs 15 have been passed through the slot 14, a plate 17 is fitted over the ends o~ the two limbs, in which plate 17 slots 18 are formed which correspond to the limbs 15. The bearing support 5 is finally secured in the framel by twist-ing the ends of the limbs 15. As a result the bearingsupport is firmly pulled onto the ridge 16 and is thus positioned relative to the frame 1.
Around the pivoting mirror 2, the mounting plate 7 and the permanent magnets 11 an annular con-trol coil 19 is mounted on the frame. By applying control voltages to the control coil the pivoting mir-S ror is pivoted about its pivoting axis 20.
Further details about the mirror bearing used in the pivoting mirror arrangement in accordance with Figs. 1 and 2 and also about that shown in Fig. 3 can be found in the` Applicantls Canadian Patents 1,070,998 and 1,078,155 which issued on February 5, 1980 and May 27, 1980 respectively.
Fig. 3 shows a different embodiment of the invention, having a bearing support 21 which has a bearing head 22 in which a slot 23 is formed which continues in a cylindrical rod 24~ A bearing 25 made of chloroprene rubber comprises a lower flange 26, an upper flange 27 and a connecting strip 28. The flange 27 is inserted into a slot 29 in the bearing head 22, so that with the aid of an auxiliary tool (not shown) the slot 23 can be widened temporarily.
The mounting plate 30 has stops 31 and 32 for a pair of permanent magnets and stops 33 and 34 for a pivoting mirror. An opening 35 is located in the centre which opening in respect of its dimensions corresponds to the upper flange 26 of the mirror bearing 25. Along the edges stops 36 and 37 are , .
,.
,., . : -: ; , -, ~
J~
located. The upper flange 26 of the mirror bearing 26 can be glued to a pivoting mirror, for example with the said glue ~octite, which is a registered trade mark. The stops 36 and 37 serve for positioning the mirror bearing during glueing.
- 12 ~
.
Claims (3)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An electrically controllable pivoting mirror arrangement suitable for use in an apparatus for optic-ally reading information tracks of an information carrier with the aid of a beam of radiation, or for writing inform-ation tracks on an information carrier, more in particular suitable for use in an optically reading video disc player, and comprising:
- a frame(l), - a pivoting mirror (2) with a reflecting front (3) and with a back (4), - permanent magnetic means (11) which are rigidly mounted on the back (4) of the pivoting mirror (2) for producing a permanent magnetic field for the elect-rical control of the pivoting mirror, and - a mirror support for pivotably supporting the pivoting mirror (2) and comprising a bearing support (5) which is connected to the frame (1) and a mirror bearing (6) which is disposed between the bearing support (5) and the back (4) of the pivot-ing mirror (2), characterized in that between the pivoting mirror (2) and the permanent magnetic means (11) a mounting plate (7) is interposed which on its side which faces the pivoting mirror (2) is provided with means (8) for positioning the pivoting mirror and on its other side is provided with means (9, 10) for positioning the permanent magnetic means (11).
- a frame(l), - a pivoting mirror (2) with a reflecting front (3) and with a back (4), - permanent magnetic means (11) which are rigidly mounted on the back (4) of the pivoting mirror (2) for producing a permanent magnetic field for the elect-rical control of the pivoting mirror, and - a mirror support for pivotably supporting the pivoting mirror (2) and comprising a bearing support (5) which is connected to the frame (1) and a mirror bearing (6) which is disposed between the bearing support (5) and the back (4) of the pivot-ing mirror (2), characterized in that between the pivoting mirror (2) and the permanent magnetic means (11) a mounting plate (7) is interposed which on its side which faces the pivoting mirror (2) is provided with means (8) for positioning the pivoting mirror and on its other side is provided with means (9, 10) for positioning the permanent magnetic means (11).
2. An electrically controllable pivoting mirror arrangement as claimed in Claim 1, the mirror bearing (6) consisting of a rubber-like elastic bearing (6) which is mounted at the back (4) of the pivoting mirror (2), the distance between the bearing support (5) and the back (4) of the pivoting mirror being less than 3 mm, characterized in that the mounting plate (7) is provided with bearing mounting means (13) on both sides of the mirror bearing (6) between which a part of the mirror bearing is clamped by its own elasticity.
3. An electrically controllable pivoting mirror arrangement as claimed in Claim 1, the mirror bearing consisting of a rubber-like elastic bearing which is glued to the back of the pivoting mirror and the distance between the bearing support and the back of the pivoting mirror being less than 3 mm, characterized in that the mounting plate is provided with means for positioning the mirror bearing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL7700674 | 1977-01-24 | ||
| NL7700674A NL7700674A (en) | 1977-01-24 | 1977-01-24 | ELECTRICALLY CONTROLLED TILT MIRROR. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1096671A true CA1096671A (en) | 1981-03-03 |
Family
ID=19827827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA295,190A Expired CA1096671A (en) | 1977-01-24 | 1978-01-18 | Electrically controllable pivoting mirror arrangement |
Country Status (16)
| Country | Link |
|---|---|
| US (1) | US4123146A (en) |
| JP (1) | JPS571309Y2 (en) |
| AT (1) | AT369177B (en) |
| AU (1) | AU510510B2 (en) |
| BE (1) | BE863212A (en) |
| BR (1) | BR7800382A (en) |
| CA (1) | CA1096671A (en) |
| DD (1) | DD134150A5 (en) |
| DE (1) | DE2801592A1 (en) |
| ES (1) | ES233471Y (en) |
| FR (1) | FR2378329A1 (en) |
| GB (1) | GB1597935A (en) |
| IT (1) | IT1092081B (en) |
| NL (1) | NL7700674A (en) |
| SE (1) | SE416007B (en) |
| ZA (1) | ZA776205B (en) |
Families Citing this family (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4371782A (en) * | 1979-12-31 | 1983-02-01 | Frans Brouwer | Optical pattern tracing system with remotely controlled kerf and forward offsets |
| NL8001617A (en) * | 1980-03-19 | 1981-10-16 | Philips Nv | DEVICE FOR ELECTRODYNAMICALLY CONTROLLED SWIVING OF AN OPTICAL ELEMENT. |
| NL8002958A (en) * | 1980-05-22 | 1981-12-16 | Philips Nv | DEVICE INCLUDING AN ELECTRICALLY CONTROLLABLE REFLECTION DEVICE FOR DETECTING A RADIATION BEAM. |
| FR2493018A1 (en) * | 1980-07-22 | 1982-04-30 | Thomson Csf | OPTICAL DEFLECTOR WITH ELECTRICAL CONTROL |
| NL8005633A (en) * | 1980-10-13 | 1982-05-03 | Philips Nv | DEVICE FOR READING AND / OR RECORDING AN OPTICALLY READABLE INFORMATION STRUCTURE. |
| EP0159406A1 (en) * | 1981-02-20 | 1985-10-30 | Kaptron Inc. | Fibre optics switch |
| FR2523351B1 (en) * | 1982-03-09 | 1989-07-13 | Thomson Csf | OPTICAL HEAD IN A RECORDING-READING DEVICE OF AN INFORMATION MEDIUM |
| JPS63311321A (en) * | 1987-06-15 | 1988-12-20 | Sharp Corp | Scanning type optical printer |
| US5015831A (en) * | 1988-11-07 | 1991-05-14 | Photographic Sciences Corporation | Scan modules for bar code readers and the like in which scan elements are flexurally supported |
| US4958894A (en) * | 1989-01-23 | 1990-09-25 | Metrologic Instruments, Inc. | Bouncing oscillating scanning device for laser scanning apparatus |
| US5066084A (en) * | 1989-02-06 | 1991-11-19 | Rockwell International Corporation | Constant velocity scanning apparatus |
| US5280165A (en) * | 1989-10-30 | 1994-01-18 | Symbol Technolgoies, Inc. | Scan pattern generators for bar code symbol readers |
| US5621371A (en) * | 1989-10-30 | 1997-04-15 | Symbol Technologies, Inc. | Arrangement for two-dimensional optical scanning with springs of different moduli of elasticity |
| US5206492A (en) * | 1989-10-30 | 1993-04-27 | Symbol Technologies, Inc. | Bar code symbol scanner with reduced power usage to effect reading |
| US5099110A (en) * | 1989-10-30 | 1992-03-24 | Symbol Technologies, Inc. | Power saving scanning arrangement |
| US5280377A (en) * | 1991-06-28 | 1994-01-18 | Eastman Kodak Company | Beam scanning galvanometer with spring supported mirror |
| US20040184124A1 (en) * | 2002-11-13 | 2004-09-23 | Olympus Corporation | Optical deflection device |
| JP4418152B2 (en) * | 2002-12-25 | 2010-02-17 | オリンパス株式会社 | Mirror support device |
| US7092135B2 (en) * | 2003-09-09 | 2006-08-15 | Benner Jr William | Moving mirror optical scanner and associated methods |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3011124A (en) * | 1958-04-15 | 1961-11-28 | Ludwig Bolkow | Light-beam deflector |
| US3892478A (en) * | 1973-09-27 | 1975-07-01 | Lissatronic Corp | Sound to image translator |
| NL181060C (en) * | 1975-10-03 | 1987-06-01 | Philips Nv | ELECTROMAGNETICALLY CONTROLLABLE RADIUS DEFLECTION DEVICE. |
| NL174609C (en) * | 1975-10-15 | 1984-07-02 | Philips Nv | TRACK MIRROR IN AN OPTICAL RECORD PLAYER. |
-
1977
- 1977-01-24 NL NL7700674A patent/NL7700674A/en not_active Application Discontinuation
- 1977-04-13 US US05/787,079 patent/US4123146A/en not_active Expired - Lifetime
- 1977-10-18 ZA ZA00776205A patent/ZA776205B/en unknown
-
1978
- 1978-01-14 DE DE19782801592 patent/DE2801592A1/en not_active Withdrawn
- 1978-01-18 CA CA295,190A patent/CA1096671A/en not_active Expired
- 1978-01-20 IT IT19487/78A patent/IT1092081B/en active
- 1978-01-20 DD DD78203339A patent/DD134150A5/en unknown
- 1978-01-20 GB GB2372/78A patent/GB1597935A/en not_active Expired
- 1978-01-20 SE SE7800694A patent/SE416007B/en unknown
- 1978-01-21 JP JP1978006276U patent/JPS571309Y2/ja not_active Expired
- 1978-01-21 ES ES1978233471U patent/ES233471Y/en not_active Expired
- 1978-01-23 AT AT0046578A patent/AT369177B/en not_active IP Right Cessation
- 1978-01-23 BR BR7800382A patent/BR7800382A/en unknown
- 1978-01-23 BE BE184552A patent/BE863212A/en unknown
- 1978-01-24 FR FR7801882A patent/FR2378329A1/en active Granted
- 1978-01-24 AU AU32683/78A patent/AU510510B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4123146A (en) | 1978-10-31 |
| JPS571309Y2 (en) | 1982-01-09 |
| FR2378329A1 (en) | 1978-08-18 |
| AU510510B2 (en) | 1980-06-26 |
| BE863212A (en) | 1978-07-24 |
| JPS53103705U (en) | 1978-08-21 |
| SE416007B (en) | 1980-11-17 |
| AU3268378A (en) | 1979-08-02 |
| DD134150A5 (en) | 1979-02-07 |
| GB1597935A (en) | 1981-09-16 |
| ZA776205B (en) | 1979-05-30 |
| BR7800382A (en) | 1978-10-10 |
| DE2801592A1 (en) | 1978-07-27 |
| IT1092081B (en) | 1985-07-06 |
| ATA46578A (en) | 1982-04-15 |
| AT369177B (en) | 1982-12-10 |
| ES233471Y (en) | 1978-07-16 |
| ES233471U (en) | 1978-03-16 |
| NL7700674A (en) | 1978-07-26 |
| IT7819487A0 (en) | 1978-01-20 |
| SE7800694L (en) | 1978-07-25 |
| FR2378329B3 (en) | 1980-10-17 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |